Probability and math activities come alive when using these colorful, specially configured, alternative dice. Dice can be used to explore problem solving such as number concepts, operations, probability, statistics, pre-algebra and more. Each set includes twelve 20-sided Polyhedra Dice. Warning Choking Hazard Small Parts not for children under 3 years. Ideal for all grades. Bundle includes 4 sets for a total of 48 dice.